I would then recommend to try following:
1. upgrade to 3.2.9
2. get 3.2.9 package file and install it once again over the "upgraded" version - that will overwrite all files in installation

make sure all files are writeable
I will also send you 3.2.6 install package to try.

Ok thakyou for file of v. 2.3.6 everythings work fine with VM ext. 2.0.1
Again If I upgrade to JS 3.2.9 something go wrong and again the cart issue.
I noticed that the parameter "site name" in VM ext. appear after upgrade the JS to 3.2.9, this is right? I supposed It was included in the ext. v. 2.0.1. So to include the site name in title page of VM product I need to upgrade to 3.2.9?it is correct?
P.S.
where I can get the 3.2.9 file? becouse the one I get override my license.

thank you

what you mean by "override my license"?
You can get it using the original download link or via eshop.

Ok, I bought from joomlaexperts.net site, my last download link was a 3.2.5 version file. I do not have any donload id link to download froma artio.net.
How we can do?

I think at Joomlaexperts.net you should be able to download 3.2.9 in Downloads section for members.

No the last version they have is a 3.2.5 that I downloaded 5 days ago, last week my 3 months membership withjoomla-experts.net is expired so I'm logged but I can't see any content in download area. What I have to do? Ask them the new file? They never answer any of my question, even in the support forum. Now they completely close the forum without answering my question. Now their forum is artio.net.